Electronic smoking device

ABSTRACT

An electronic smoking device ( 10 ) comprises a power supply/atomizer portion ( 12 ) and a replaceable liquid reservoir portion ( 14 ) which is coupleable with the power supply/atomizer portion ( 12 ). The liquid reservoir portion comprises a liquid reservoir ( 34 ) storing a liquid and the power supply/atomizer portion comprises a power supply ( 18 ) and an atomizer ( 26 ) adapted to atomize the liquid stored in the liquid reservoir when operated by the power supply. The power supply/atomizer portion comprises a penetrating element ( 40 ) that is configured to penetrate the liquid reservoir when the power supply/atomizer portion is coupled with the liquid reservoir portion, and a wick ( 30 ). The wick ( 30 ) is attached to the penetrating element and is configured so that a portion ( 31 ) of the wick entering the liquid reservoir when the power supply/atomizer portion is coupled with the liquid reservoir portion has a U-shape.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. application Ser. No.16/319,193, filed 18 Jan. 2019 (the '193 application), which is thenational stage application of International application no.PCT/EP2017/068439, filed 21 Jul. 2017 (the '439 application) andpublished under International publication no. WO/2018/015521 on 25 Jan.2018. This application claims priority to European application no.16180789.6, filed 22 Jul. 2016 (the '789 application). The '193application, '439 application and the '789 application are all herebyincorporated by reference in their entirety as though fully set forthherein.

FIELD OF INVENTION

The present invention relates generally to electronic smoking devicesand in particular to electronic cigarettes.

BACKGROUND OF THE INVENTION

An electronic smoking device, such as an electronic cigarette(e-cigarette), typically has a housing accommodating an electric powersource (e.g. a single use or rechargeable battery, electrical plug, orother power source), and an electrically operable atomizer. The atomizervaporizes or atomizes liquid supplied from a reservoir and providesvaporized or atomized liquid as an aerosol. Control electronics controlthe activation of the atomizer. In some electronic cigarettes, anairflow sensor is provided within the electronic smoking device, whichdetects a user puffing on the device (e.g., by sensing an under-pressureor an air flow pattern through the device). The airflow sensor indicatesor signals the puff to the control electronics to power up the deviceand generate vapor. In other e-cigarettes, a switch is used to power upthe e-cigarette to generate a puff of vapor.

Constant supply of liquid to the atomizer has to be ensured.

SUMMARY OF THE INVENTION

In accordance with one aspect of the present invention there is providedan electronic smoking device comprising a power supply/atomizer portionand a replaceable liquid reservoir portion which is coupleable with thepower supply/atomizer portion. The liquid reservoir portion comprises aliquid reservoir storing a liquid. The power supply/atomizer portioncomprises a power supply and an atomizer adapted to atomize the liquidstored in the liquid reservoir when operated by the power supply. Thepower supply/atomizer portion comprises a penetrating element that isconfigured to penetrate the liquid reservoir when the powersupply/atomizer portion is coupled with the liquid reservoir portion.The power supply/atomizer portion further comprises a wick that isattached to the penetrating element and is configured so that a portionof the wick entering the liquid reservoir when the power supply/atomizerportion is coupled with the liquid reservoir portion has a U-shape.

The characteristics, features and advantages of this invention and themanner in which they are obtained as described above, will become moreapparent and be more clearly understood in connection with the followingdescription of exemplary embodiments, which are explained with referenceto the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

In the drawings, same element numbers indicate same elements in each ofthe views:

FIG. 1 is a schematic cross-sectional illustration of an exemplaryelectronic cigarette;

FIG. 2 is a schematic partial cross-sectional view of a powersupply/atomizer portion according to an embodiment;

FIG. 3 is a schematic partial cross-sectional view of a powersupply/atomizer portion according to another embodiment;

FIG. 4 is a schematic cross-sectional view of a liquid reservoir portionfor an electronic cigarette according to FIG. 1; and

FIG. 5 is a schematic partial cross-sectional view of an embodiment ofthe electronic cigarette.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

Throughout the following, an electronic smoking device will beexemplarily described with reference to an e-cigarette. As is shown inFIG. 1, an e-cigarette 10 typically has a housing comprising acylindrical hollow tube having an end cap 16. The cylindrical hollowtube may be a single-piece or a multiple-piece tube. In FIG. 1, thecylindrical hollow tube is shown as a two-piece structure having a powersupply/atomizer portion 12 and a liquid reservoir portion 14. Togetherthe power supply/atomizer portion 12 and the liquid reservoir portion 14form a cylindrical tube which can be approximately the same size andshape as a conventional cigarette, typically about 100 mm with a 7.5 mmdiameter, although lengths may range from 70 to 150 or 180 mm, anddiameters from 5 to 28 mm.

The power supply/atomizer portion 12 and the liquid reservoir portion 14are typically made of metal, e.g. steel or aluminum, or of hardwearingplastic and act together with the end cap 16 to provide a housing tocontain the components of the e-cigarette 10. The power supply/atomizerportion 12 and a liquid reservoir portion 14 may be configured to fittogether by a friction push fit, a snap fit, or a bayonet attachment,magnetic fit, or screw threads. The end cap 16 is provided at the frontend of the power supply portion 12. The end cap 16 may be made fromtranslucent plastic or other translucent material to allow alight-emitting diode (LED) 20 positioned near the end cap to emit lightthrough the end cap. The end cap can be made of metal or other materialsthat do not allow light to pass.

An air inlet may be provided in the end cap, at the edge of the inletnext to the cylindrical hollow tube, anywhere along the length of thecylindrical hollow tube, or at the connection of the powersupply/atomizer portion 12 and the liquid reservoir portion 14. FIG. 1shows a pair of air inlets 38 provided approximately in the middle thecylindrical hollow tube.

A power supply, preferably a battery 18, an LED 20, control electronics22 and optionally an airflow sensor 24 are provided within thecylindrical hollow tube power supply/atomizer portion 12. The battery 18is electrically connected to the control electronics 22, which areelectrically connected to the LED 20 and the airflow sensor 24. In thisexample the LED 20 is at the front end of the power supply/atomizerportion 12, adjacent to the end cap 16 and the control electronics 22and airflow sensor 24 are provided in the central cavity at the otherend of the battery 18 adjacent the liquid reservoir portion 14.

The airflow sensor 24 acts as a puff detector, detecting a user puffingor sucking on the liquid reservoir portion 14 of the e-cigarette 10. Theairflow sensor 24 can be any suitable sensor for detecting changes inairflow or air pressure, such as a microphone switch including adeformable membrane which is caused to move by variations in airpressure. Alternatively the sensor may be a Hall element or anelectro-mechanical sensor.

The control electronics 22 are also connected to an atomizer 26. In theexample shown, the atomizer 26 includes a heating coil 28 which iswrapped around a wick 30 extending inside an atomizing chamber 29 thatis connected to an air passage 27. The wick 30 and heating coil 28 donot completely block the atomizing chamber 29. Rather an air gap isprovided on either side of the heating coil 28 enabling air to flow pastthe heating coil 28 and the wick 30. The atomizer may alternatively useother forms of heating elements, such as ceramic heaters, or fiber ormesh material heaters. Nonresistance heating elements such as sonic,piezo and jet spray may also be used in the atomizer in place of theheating coil.

The wick 30 may be a porous material such as a bundle of fiberglassfibers, with liquid in the liquid reservoir 34 drawn by capillary actionfrom the portion 31 of the wick 30 that extends into the liquidreservoir towards the portion of the wick 30 encircled by the heatingcoil 28.

The liquid reservoir portion 14, which is replaceable and which is shownin FIG. 1 in a state coupled with the power supply/atomizer portion 12,includes the liquid reservoir 34 that is adapted for storing liquid toby atomized or vaporized. In the embodiment according to FIG. 1, theliquid reservoir 34 further comprises a plug of reservoir material 34 a.The reservoir material 34 a can alternatively fill a larger portion orthe entire cavity that forms part of the liquid reservoir 34. The plugof reservoir material 34 a may serve to prevent leakage of fluid fromthe liquid reservoir 34. Further, the liquid reservoir material 34 a isconfigured to form a capillary connection to the portion 31 of the wick30 that enters the liquid reservoir 34 when the power supply/atomizerportion 12 is coupled with the liquid reservoir portion 14. Thereservoir material 34 a may e.g. comprise of a porous material that issoaked in liquid stored in the liquid reservoir 34. The reservoirmaterial 34 a may be elastic, i.e. non-permanently deformable, e.g. likefoam, or permanently deformable.

The power supply/atomizer portion 12 includes a penetrating element 40that is configured to penetrate the liquid reservoir 34 when the powersupply/atomizer portion 12 is coupled with the liquid reservoir portion14. The wick 30 is attached to the penetrating element 40 and isconfigured so that a portion 31 of the wick 30 entering the liquidreservoir 34 when the power supply/atomizer 12 portion is coupled withthe liquid reservoir portion 12 has a U-shape.

The U-shaped portion 31 of the wick 30 includes a bending portion 31 aand two leg portions 31 b, 31 c. Extensions 32 b, 32 c of the legportions 31 b, 31 c extend towards the heating coil 28 and the bendingportion 31 a faces the liquid reservoir 34 when the powersupply/atomizer portion 12 is coupled with the liquid reservoir portion14.

Compared to a simple single stranded wick entering the liquid reservoir34, the U-shaped wick portion 31 provides the advantages that a greatersurface for liquid transport is provided, thereby effectively improvingthe liquid feed to the heating element 28.

The penetrating element 40 comprises a piercing element 42 at the endfacing the liquid reservoir 34. The piercing element 42 is configured topierce the reservoir material 34 a when the power supply/atomizerportion 12 is coupled with the liquid reservoir portion 14. The piercingelement 42 can be formed using a spike, a blade or the like. By means ofthe piercing element 42, the U-shaped portion 31 of the wick 30 easilyenters the liquid reservoir material 34 a when the power supply/atomizerportion 12 is coupled with the liquid reservoir portion 14.

To avoid deformation and/or dislocation of the wick portion 31 when thepower supply/atomizer portion 12 is coupled with the liquid reservoirportion 14, the wick 30 is suitably attached to the powersupply/atomizer portion 12. In particular, the wick 30 is attached tothe penetrating element 40 so that the wick 30 is kept under tension. Tothat end, the one end of the wick 30 facing away from the liquidreservoir 34 is fixed by means of a suitable fixing element 35, such asa fixing pin. The other end of the wick 30 facing the liquid reservoir34, namely the U-shaped portion 31, is attached to the penetratingelement 40 by hooking the bending portion 31 a of the U-shaped portion31 of the wick 30 into a holding portion 37 of the penetrating element40. The holding portion 37 may be formed as a pin or hook.Alternatively, the holding portion may be formed by a recess in thepenetrating element 40 through which the wick 30 is threaded in the areaof the bending portion 31 a.

Attaching the wick 30 to the penetrating element 40 in this way firstassures that the wick 30 is not deformed, i.e. bent back, when the powersupply/atomizer portion 12 is coupled with the liquid reservoir 14, butproperly enters the liquid reservoir 24. Further, due to the attachment,the wick 30 properly contacts with the liquid reservoir material 34 a,thereby establishing a capillary contact with the liquid reservoirmaterial 34 a which improves liquid feed towards the heating element 28.Capillary action keeps the wick 30 saturated while the liquid reservoir34 contains liquid.

Preferably, at least one extension 32 b, 32 c of a leg portion 31 b, 31c of the U-shaped portion 31 of the wick 30 is wrapped by the heatingcoil 28 of the power supply/atomizer portion. In the example shown inFIG. 1, the two extensions 32 b, 32 c of the leg portion 31 b, 31 c ofthe U-shaped portion 31 rejoin to form a single stranded wick portion33. In other words, the U-shaped portion 31 forms part of some sort ofclosed loop formed at the end of the wick 31 facing the liquid reservoir34. In this case, the single stranded wick portion 33 is wrapped by theheating coil 28 of the power supply/atomizer portion 12. Alternativeembodiments are described below with reference to FIGS. 2 and 3.

By means of a one-way-design, e.g. by providing the liquid reservoirportion 14 with a slanted face (not shown) on the end to be coupled withthe power supply/atomizer portion 12, misalignment of the liquidreservoir portion 14 with respect to the power supply/atomizer portion12 can be avoided.

As shown in FIG. 1, the piercing portion 42 does not protrude from thepower supply/atomizer portion 12, but is rather arranged in a retractedmanner, subflush with the outer sleeve of the power supply atomizerportion 12. In this way, a direct contact with the piercing portion 42can be avoided when no liquid reservoir portion 14 is coupled to thepower supply/atomizer portion 12.

An air inhalation port 36 is provided at the back end of the liquidreservoir portion 14 remote from the end cap 16. The inhalation port 36may be formed from the cylindrical hollow tube liquid reservoir portion14 or maybe formed in an end cap.

In use, a user sucks on the e-cigarette 10. This causes air to be drawninto the e-cigarette 10 via one or more air inlets, such as air inlets38, and to be drawn through the atomizing chamber 29 and the air passage27 towards the air inhalation port 36. The change in air pressure whicharises is detected by the airflow sensor 24, which generates anelectrical signal that is passed to the control electronics 22. Inresponse to the signal, the control electronics 22 activate the heatingcoil 28, which causes liquid present in the wick 30 to be vaporizedcreating an aerosol (which may comprise gaseous and liquid components)within the atomizing chamber 29. As the user continues to suck on thee-cigarette 10, this aerosol is drawn through the air passage 27 andinhaled by the user. At the same time the control electronics 22 alsoactivate the LED 20 causing the LED 20 to light up which is visible viathe translucent end cap 16 mimicking the appearance of a glowing emberat the end of a conventional cigarette. As liquid present in the wick 30is converted into an aerosol more liquid is drawn into the wick 30 fromthe liquid reservoir 34 by capillary action and thus is available to beconverted into an aerosol through subsequent activation of the heatingcoil 28. As already mentioned above, the U-shaped design of the wickportion 31 entering the liquid reservoir improves liquid feed to theheating element 28.

Some e-cigarettes are intended to be disposable and the electric powerin the battery 18 is intended to be sufficient to vaporize the liquidcontained within the liquid reservoir 34, after which the e-cigarette 10is thrown away. In other embodiments the battery 18 is rechargeable andthe liquid reservoir 34 is refillable. In the cases where the liquidreservoir 34 is a toroidal cavity, this may be achieved by refilling theliquid reservoir 34 via a refill port. In other embodiments, asdescribed with reference to FIG. 1, the liquid reservoir portion 14 ofthe e-cigarette 10 is detachable from the power supply portion/atomizerportion 12 and a new liquid reservoir portion 14 can be fitted with anew liquid reservoir 34 thereby replenishing the supply of liquid. Insome cases, replacing the liquid reservoir 34 may involve replacement ofthe heating coil 28 and the wick 30 along with the replacement of theliquid reservoir 34. A replaceable unit comprising the atomizer 26 andthe liquid reservoir 34 is called a cartomizer.

The new liquid reservoir 34 may be in the form of a cartridge having anair passage 27 through which a user inhales aerosol. In otherembodiments, aerosol may flow around the exterior of the cartridge to anair inhalation port 36.

Of course, in addition to the above description of the structure andfunction of a typical e-cigarette 10, variations also exist. Forexample, the LED 20 may be omitted. The airflow sensor 24 may be placedadjacent the end cap 16 rather than in the middle of the e-cigarette.The airflow sensor 24 may be replaced with a switch which enables a userto activate the e-cigarette manually rather than in response to thedetection of a change in air flow or air pressure.

Different types of atomizers may be used. Thus, for example, theatomizer may have a heating coil in a cavity in the interior of a porousbody soaked in liquid. In this design aerosol is generated byevaporating the liquid within the porous body either by activation ofthe coil heating the porous body or alternatively by the heated airpassing over or through the porous body. Alternatively, the atomizer mayuse a piezoelectric atomizer to create an aerosol either in combinationor in the absence of a heater.

FIG. 2 is a schematic partial cross-sectional view of a powersupply/atomizer portion 112 according to an embodiment.

In contrast to the embodiment shown in FIG. 1, the two extensions 132 b,132 c of the two leg portions 31 b, 31 c do not completely rejoin toform a single stranded wick portion, but remain separate linear wickportions that are arranged adjacent to each other. The two extensions132 b, 132 c of leg portions 31 b, 31 c of the U-shaped portion 31 ofthe wick 30 are wrapped by a single heating coil 128 of the powersupply/atomizer portion 112. This configuration has the advantage thatit can be easily manufactured. Due to the fact that the heating coil 128is wrapped around both extensions of the leg portions, twice the amountof liquid is available for vaporization compared to the case where onlya single leg extension is surrounded by the heating coil 128. The twoextensions 132 b, 132 c can e.g. be kept together by tightly winding theheating coil 128 around the extensions 132 b, 132 c.

Further, in contrast to the embodiment shown in FIG. 1, where a simpleholding portion 37 in the form of a pin or the like has been shown inorder to hook in the looped wick 30, holding portion 137 is configuredto further support the U-shaped portion 31 of the wick 30 in thelongitudinal direction. This has the advantage that the wick 30 evenbetter remains in place when the power supply/atomizer portion 112 iscoupled with the liquid reservoir portion 14, so that the wick 30 can bepressed against the reservoir material 34 a without moving back.Constant and reliable capillary contact between the wick 30 and thereservoir material 34 a is thereby ensured.

Apparently, these two differentiating features are independent from eachother.

FIG. 3 is a schematic partial cross-sectional view of a powersupply/atomizer portion 212 according to another embodiment.

This embodiment mainly serves to point out that the term “U-shaped” hasto be interpreted broadly in the context of the present invention.U-shaped means that there is a continuous linear wick portion that, onone end includes a first leg portion 131 b and on the other end includesa second leg portion 131 c, wherein both leg portions 131 b, 131 c arearranged in the power supply/atomizer portion to be essentiallyparallel, and wherein the two leg portions 131 b, 131 c are connected byat least one curved or bended portion 31 a (cf. FIG. 1). However, in thecontext of the present invention, the term “U-shaped” also includescases where the simple bending portion 31 a that connects the two legportions 131 b, 131 c in the form of a semi-circular arc is replaced bya more complex or irregular portion of the linear wick, which portionmay include an irregular curved course and/or may include more than onebending portion, which bending portions may be differently curved. Inthe embodiment shown in FIG. 3, the wick 30 is wound around the holdingportion 237, for example a holding pin, twice and therefore includes twobending portions 131 a, 131 a′ facing the liquid reservoir 34—and onebending portion facing in the opposite direction. Compared to FIGS. 1and 2, this embodiment provides an even greater surface area for liquidflow when the power supply/atomizer portion 212 is coupled to the liquidreservoir portion 14.

FIG. 4 is a schematic cross-sectional view of a liquid reservoir portion114 for an electronic cigarette according to FIG. 1.

In addition to the liquid reservoir portion 14 shown in FIG. 1, theliquid reservoir portion 114 according to FIG. 4 includes a sealingelement 44 which is configured to seal an opening 45 of the liquidreservoir 34 to be penetrated by the penetrating element 40 before thepower supply/atomizer portion 12 is coupled with the liquid reservoirportion 114. The sealing element 44 can be a heat sealed foil or thelike. The sealing element 44 provides two functions. First, the sealingelement 44 ensures containment of the liquid within the liquid reservoir34 before the power supply/atomizer portion 12 is coupled with theliquid reservoir portion 114. Second, an intact sealing element 44indicates an unused liquid reservoir 34.

The sealing element 44 is configured to be peeled off before the powersupply/atomizer portion 12 is coupled with the liquid reservoir portion14.

Alternatively or additionally, the piercing element 42 can be configuredto pierce the sealing element 44 when the power supply/atomizer portion12 is coupled with the liquid reservoir portion 14. Thereby, the step ofpeeling off the sealing element can be avoided.

In case the sealing element 44 is configured so that it still provides asealing function when punctured by the piercing element 42, the plug ofliquid reservoir material 34 a may be dispensable.

FIG. 5 is a schematic partial cross-sectional view of an embodiment ofan electronic cigarette.

In FIG. 5, another type of sealing element 46 is shown, which is notpresent in FIG. 1. The sealing element 46, in the form of a compliantseal, is part of the power supply/atomizer portion 312. The sealingelement 46 is configured, when the power supply/atomizer portion 312 iscoupled with the liquid reservoir portion 14, to form both an air sealaround the air passage 27 of the liquid reservoir portion 14 and aliquid seal around the opening 45 of the liquid reservoir 34 of theliquid reservoir portion 14. The sealing element 46 is in particularintended to form some sort of bulkhead between the liquid reservoirportion 14 and the power supply/atomizer portion 312, in order toprevent liquid from flowing into the power supply/atomizer portion 312in an uncontrolled manner. The sealing element 46 can e.g. be providedin the form of a face seal or radial seal.

In summary, in one aspect the electronic smoking device has a powersupply/atomizer portion and a replaceable liquid reservoir portion whichis coupleable with the power supply/atomizer portion. The liquidreservoir portion comprises a liquid reservoir storing a liquid and thepower supply/atomizer portion comprises a power supply and an atomizeradapted to atomize the liquid stored in the liquid reservoir whenoperated by the power supply. The power supply/atomizer portion furthercomprises a penetrating element that is configured to penetrate theliquid reservoir when the power supply/atomizer portion is coupled withthe liquid reservoir portion, and a wick. The wick is attached to thepenetrating element and is configured so that a portion of the wickentering the liquid reservoir when the power supply/atomizer portion iscoupled with the liquid reservoir portion has a U-shape.

According to an embodiment, the penetrating element comprises a piercingelement and the liquid reservoir includes a reservoir material at leastpartially filling the liquid reservoir. The piercing element isconfigured to pierce the reservoir material when the powersupply/atomizer portion is coupled with the liquid reservoir portion.

According to an embodiment, a bending portion of the U-shaped portion ofthe wick faces the liquid reservoir when the power supply/atomizerportion is coupled with the liquid reservoir portion.

According to an embodiment, at least one extension of a leg portion ofthe U-shaped portion of the wick is wrapped by a heating coil of thepower supply/atomizer portion. Preferably, two extensions of legportions of the U-shaped portion of the wick are wrapped by a singleheating coil of the power supply/atomizer portion.

According to an embodiment, two extensions of leg portions of theU-shaped portion of the wick rejoin to form a single stranded wickportion. The single stranded wick portion can be wrapped by a singleheating coil of the power supply/atomizer portion.

According to an embodiment, the wick is attached to the penetratingelement so that the wick is kept under tension. The bending portion ofthe U-shaped portion of the wick can be hooked into a holding portion ofthe penetrating element.

According to an embodiment, the U-shaped portion of the wick isconfigured to form a capillary connection to the reservoir material ofthe liquid reservoir when the power supply/atomizer portion is coupledwith the liquid reservoir portion.

According to an embodiment, an opening of the liquid reservoir to bepenetrated by the penetrating element of the power supply/atomizerportion is closed by means of a sealing element before the powersupply/atomizer portion is coupled with the liquid reservoir portion.The sealing element can be configured to be peeled off before the powersupply/atomizer portion is coupled with the liquid reservoir portion.

According to an embodiment, the piercing element is configured to piercethe sealing element of the liquid reservoir portion when the powersupply/atomizer portion is coupled with the liquid reservoir portion.

According to an embodiment, the power supply/atomizer portion includesanother sealing element that is configured, when the powersupply/atomizer portion is coupled with the liquid reservoir portion, toform both an air seal around an air passage of the liquid reservoirportion and a liquid seal around an opening of the liquid reservoir ofthe liquid reservoir portion.

According to a second aspect, a power supply/atomizer portion of anelectronic smoking device is provided, which power supply/atomizerportion is configured to be coupled with a replaceable liquid reservoirportion for the electronic smoking device. The liquid reservoir portioncomprises a liquid reservoir storing a liquid. The power supply/atomizerportion comprises a power supply and an atomizer adapted to atomize theliquid stored in the liquid reservoir when the power supply/atomizerportion is coupled with the liquid reservoir portion and when theatomizer is operated by the power supply. The power supply/atomizerportion further comprises a penetrating element that is configured topenetrate the liquid reservoir when the power supply/atomizer portion iscoupled with the liquid reservoir portion, and a wick. The wick isattached to the penetrating element so that a portion of the wickentering the liquid reservoir when the power supply/atomizer portion iscoupled with the liquid reservoir portion has a U-shape.

Preferred features of the power supply/atomizer portion according to thesecond aspect have already been mentioned with respect to the electronicsmoking device according to the first aspect.

While this invention has been described in connection with what ispresently considered to be practical exemplary embodiments, it is to beunderstood that the invention is not limited to the disclosedembodiments, but, on the contrary, is intended to cover variousmodifications and equivalent arrangements included within the scope ofthe appended claims.

LIST OF REFERENCE SIGNS

-   10, 110 electronic smoking device-   12, 112, 212, 312 power supply/atomizer portion-   14, 114 liquid reservoir portion-   16 end cap-   18 battery-   20 light-emitting diode (LED)-   22 control electronics-   24 airflow sensor-   26, 126, 226 atomizer-   27 air passage-   28, 128 heating coil-   29 atomizing chamber-   30 wick-   31 U-shaped portion of wick-   31 a, 131 a, 131 a′ bending portion of U-shaped portion-   31 b, 31 c, 131 b, 131 c leg portion of U-shaped portion-   32 b, 32 c, 132 b, 132 c extension portion of leg portion-   33 single stranded wick portion-   34 liquid reservoir-   34 a reservoir material-   35 fixing element-   36 air inhalation port-   37, 137, 237 holding portion-   38 air inlets-   40 penetrating element-   42 piercing element-   44 sealing element-   45 opening-   46 sealing element

1. An electronic smoking device (10) comprising a power supply/atomizerportion (12) and a replaceable liquid reservoir portion (14) which iscoupleable with the power supply/atomizer portion (12), wherein theliquid reservoir portion (14) comprises a liquid reservoir (34) adaptedfor storing a liquid and the power supply/atomizer portion (12)comprises a power supply (18) and an atomizer (26) adapted to atomize aliquid stored in the liquid reservoir (34) when operated by the powersupply (18), wherein the power supply/atomizer portion (12) comprises apenetrating element (40) that is configured to penetrate the liquidreservoir (34) when the power supply/atomizer portion (12) is coupledwith the liquid reservoir portion (14) and a wick (30) that is attachedto the penetrating element (40) and is configured so that a portion (31)of the wick (30) entering the liquid reservoir (34) when the powersupply/atomizer portion (12) is coupled with the liquid reservoirportion (14) has a U-shape. 2.-15. (canceled)